Hello, I've activated the Authorize.net SIM plugin, completed the required fields in the plugin's configuration, and followed the instructions in gray at the bottom of that page. Yet, when I go to purchase a membership on signup.php, I fill in all the mandatory aMember fields and click Continue. Then I Agree to the terms and click Continue again. Then I am brought back to the previous page, and all the fields are empty. No Authorize.net stuff. What am I doing wrong? Please help!